Magnetic levitation sonic brushless motor control system

Abstract

The present invention relates to the technical field of motor control, and specifically to a magnetic levitation sonic brushless motor control system, comprising a brushless motor, wherein the brushless motor is electrically connected to a first control module, the first control module is electrically connected to a second control module, the second control module is electrically connected to a power amplification module, and the power amplification module is electrically connected to the brushless motor. According to the control system of the present invention, constant power control is performed by means of the first control module, the frequency and duty cycle of the second control module is changed so as to achieve change in swing amplitude / speed and vibration intensity / speed, and the power of a control signal is amplified by means of the power amplification module, so that the motor can be directly driven to do work, different motion modes can be achieved, and therefore there is no need to additionally provide a position sensing element, thereby simplifying the overall device connection.

Description

A magnetic levitation acoustic wave brushless motor control system Technical Field

[0001] The present invention relates to the technical field of motor control, in particular to a magnetic levitation acoustic wave brushless motor control system. Background Art

[0002] Vibrating electric toothbrushes are widely recognized and favored in the market for their advantages, such as minimal wear on teeth and gum damage. Vibrating electric toothbrushes use a vibrating motor to generate high-frequency vibrations perpendicular to the length of the handle, achieving efficient tooth cleaning. Technical issues

[0003] Current vibrating electric toothbrushes can only achieve high-frequency reciprocating vibrations, but cannot simulate the large reciprocating swing of a human hand in the axial direction around the motor shaft. Electric toothbrushes that have both large swings and vibrations on the market are achieved by introducing a three-phase brushless motor + a simple servo control system. However, this type of electric toothbrush has a complex structure, high cost, poor manufacturability and reliability, and requires the additional installation of position sensing elements. Therefore, in order to solve the above problems, it is urgent to propose a new single-phase brushless motor + a simple control system to achieve the sweeping vibration effect of the electric toothbrush. Technical Solutions

[0004] The object of the present invention is to provide a magnetic levitation acoustic wave brushless motor control system to solve the problems raised in the above background technology.

[0005] The technical solution of the present invention is: a magnetic levitation acoustic wave brushless motor control system, including a brushless motor, the brushless motor is electrically connected to a first control module, the first control module is electrically connected to a second control module, the second control module is electrically connected to a power amplifier module, and the power amplifier module is electrically connected to the brushless motor.

[0006] Furthermore, the first control module includes a current detector and a current regulator. The current detector is electrically connected to the brushless motor and the current regulator. The current regulator is electrically connected to the second control module.

[0007] Furthermore, the second control module includes multiple frequency / duty cycle regulators, which are connected in parallel with each other. At the same time, the multiple frequency / duty cycle regulators connected in parallel are electrically connected to a PWM generator and a current regulator, and the PWM generator is electrically connected to a power amplifier module.

[0008] Furthermore, each of the frequency / duty cycle regulators adjusts the frequency by the duration of power-on.

[0009] Furthermore, the frequency / duty cycle regulator adjusts the swing amplitude / vibration speed by frequency, and the frequency / duty cycle regulator adjusts the swing / vibration intensity by duty cycle.

[0010] Furthermore, the power amplifier module includes but is not limited to a MOS tube, the gate of the MOS tube is electrically connected to the PWM generator, the source of the MOS tube is electrically connected to the brushless motor, and the drain of the MOS tube is electrically connected to the power supply voltage. Beneficial effects

[0011] The present invention provides a magnetic levitation acoustic wave brushless motor control system through improvement, which has the following improvements and advantages compared with the prior art:

[0012] The control system of the present invention performs constant power control through the first control module, and changes the frequency and duty cycle of the second control module to achieve changes in the swing amplitude / speed and vibration intensity / speed. The power of the control signal is amplified by the power amplifier module, thereby directly driving the motor to do work and realizing different motion modes. There is no need to additionally set up position sensing elements, thereby simplifying the overall connection of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further explained below in conjunction with the accompanying drawings and examples:

[0014] FIG1 is a system framework diagram of a magnetic levitation acoustic brushless motor control system according to the present invention;

[0015] FIG2 is a signal waveform diagram corresponding to two frequency / duty cycle regulators of the present invention. Modes for Carrying Out the Invention

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0017] It should be noted that, in the description of the present invention, the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description. They do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] Furthermore, it should be understood that for the sake of ease of description, the sizes of the various components shown in the drawings are not drawn according to actual proportions. For example, the thickness or width of certain layers may be exaggerated relative to other layers.

[0019] It should be noted that like numbers and letters represent similar items in the following figures, so once an item is defined or described in one figure, it will not need to be further discussed and described in detail in the description of the subsequent figures.

[0020] With reference to FIG1 , this embodiment provides a magnetic levitation sonic brushless motor control system, which includes a brushless motor, a first control module, a second control module, and a power amplifier module. The brushless motor is electrically connected to the first control module, the first control module is electrically connected to the second control module, the second control module is electrically connected to the power amplifier module, and the power amplifier module is electrically connected to the brushless motor. In this embodiment, the brushless motor is selected as a single-phase magnetic levitation sonic brushless motor, which can achieve large-scale swing and high-frequency vibration. Specifically, the brushless motor in this embodiment can achieve a maximum swing of ±60°, and the swing size can be specifically selected according to actual usage. At the same time, its vibration frequency vibrates at a standard of 31,000 times / minute. Similarly, its vibration frequency can also be specifically selected according to actual usage.

[0021] In this embodiment, the first control module includes a current detector and a current regulator. The current detector is electrically connected to the brushless motor and the current regulator, and the current regulator is electrically connected to the second control module. Specifically, the first control module implements a current loop to achieve constant power control, allowing the brushing force to be adjusted according to the needs of different users.

[0022] Furthermore, the second control module includes multiple frequency / duty cycle regulators, each of which is connected in parallel. Each of the multiple frequency / duty cycle regulators is electrically connected to a PWM generator and a current regulator, and the PWM generator is electrically connected to the power amplifier module. In this embodiment, each frequency / duty cycle regulator can adjust its frequency by adjusting the duration of power supply. Specifically, in this embodiment, two frequency / duty cycle regulators are provided, i.e., two frequency / duty cycle regulators are connected in parallel and are electrically connected to the PWM generator.

[0023] Refer to Figure 2, which shows the signal waveforms corresponding to the two frequency / duty cycle regulators. As can be seen from Figure 2, the abscissa represents time t, the inverse of the power-on frequency, and the ordinate represents the voltage. The solid line in the figure represents the square wave signal emitted by the first frequency / duty cycle regulator, while the dashed line represents the square wave signal emitted by the second frequency / duty cycle regulator. Specifically, the frequency can be adjusted by adjusting the power-on duration, and the duty cycle can be adjusted by adjusting the width of each waveform. When the dashed line signal is superimposed on the solid line signal, it can achieve large-amplitude swing and high-frequency vibration. In other words, the frequency / duty cycle regulator adjusts the swing amplitude / vibration speed by frequency, while the frequency / duty cycle regulator adjusts the swing / vibration intensity by duty cycle. Specifically, the solid square wave signal controls large-amplitude swing, and the swing amplitude and speed can be changed by varying the frequency and duty cycle. The dashed square wave signal controls high-frequency vibration, and the vibration intensity and speed can be changed by varying the frequency and duty cycle.

[0024] In this embodiment, the power amplifier module includes, but is not limited to, a MOS transistor. Specifically, in this embodiment, the power amplifier module is configured as an inverter MOS transistor, wherein the gate of the inverter MOS transistor is electrically connected to the PWM generator, the source of the inverter MOS transistor is electrically connected to the brushless motor, and the drain of the inverter MOS transistor is electrically connected to the power supply voltage. Furthermore, the inverter MOS transistor can amplify the power of the control signal, thereby driving the brushless motor to perform work and achieve different motion modes. It serves as a bridge for converting electrical signals into external work performed by the motor.

[0025] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A magnetic levitation acoustic wave brushless motor control system, characterized in that: The brushless motor is electrically connected to a first control module, the first control module is electrically connected to a second control module, the second control module is electrically connected to a power amplifier module, and the power amplifier module is electrically connected to the brushless motor.

2. A magnetic levitation acoustic wave brushless motor control system according to claim 1, characterized in that: The first control module includes a current detector and a current regulator. The current detector is electrically connected to the brushless motor and the current regulator. The current regulator is electrically connected to the second control module.

3. A magnetic levitation acoustic wave brushless motor control system according to claim 1 or 2, characterized in that: The second control module includes multiple frequency / duty cycle regulators, which are connected in parallel with each other. At the same time, the multiple frequency / duty cycle regulators connected in parallel are electrically connected to a PWM generator and a current regulator, and the PWM generator is electrically connected to a power amplifier module.

4. The magnetic levitation acoustic wave brushless motor control system according to claim 3, characterized in that: Each of the frequency / duty cycle regulators adjusts the frequency by the duration of power-on.

5. The magnetic levitation acoustic wave brushless motor control system according to claim 4, characterized in that: The frequency / duty cycle regulator adjusts the swing amplitude / vibration speed by frequency, and the frequency / duty cycle regulator adjusts the swing / vibration intensity by duty cycle.

6. The magnetic levitation acoustic wave brushless motor control system according to claim 3, characterized in that: The power amplifier module includes but is not limited to a MOS tube, a gate of the MOS tube is electrically connected to a PWM generator, a source of the MOS tube is electrically connected to a brushless motor, and a drain of the MOS tube is electrically connected to a power supply voltage.

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